The hot stamping process and process parameters are investigated for a model of a B-pillar outer plate by numerical simulation. The feasibility of hot stamping forming process and its parameters are analyzed. The effectiveness of numerical simulation and the accuracy of hot stamping forming process and its parameters for B-pillar outer plate are proved by the hot stamping experiment and tensile tests. Three models are designed to analyze the effect of B-pillar in the vehicle side impact. It shows that hot stamping technology has the advantages in the field of lightweight and improving impact resistance. Through the research of the historical process of hot forming part, the residual strain characteristics of hot stamping parts is analyzed, the produce and mechanism of residual strain is explained, and the application method based on the forming history of hot stamping technology is provided.
Microstructure, microhardness and tribological properties of laser hardened GCr15 steel were investigated in this paper. The wear resistance under lubricated sliding conditions was compared between specimens treated with laser and those of conventionally hardened. The tribological properties of laser surface-quenched GCr15 steel specimens were slightly better due to the effects of the microstructure hardening, high hardness and toughness, with the wear rate (in the order of 10-6mg/Nm) lower than that of the conventionally treated specimens. At the steady state, the frictional coefficient of laser-treated samples had no obvious difference from that of the conventionally treated samples. The wear mechanism for both cases was similar, generally involved surface fatigue wear and slight abrasion wear. LeiQ.K. Liu S. Lei Introduction H. Li In recent years, among the various surface modification methods, laser-induced surface modification has gained much attention for achieving the desired properties for applications[1]. This method is mainly used for ferrous alloys which undergo martensitic transformation and thus form a very hard surface layer with negligible surface roughness and distortion[2]. Some ideas demonstrated that the wear rate at a particular contact pressure can be strongly influenced by the microstructure of the steel, but there is also contrary idea that under the conditions of mild wear, the microstructural constituents of steels have no significant influence on the wear rate, although they affect the rate of severe wear. Previous studies of the authors demonstrated that under the dry sliding wear conditions, laser surface-hardened specimens of ferrous alloys exhibited enhanced wear resistance than conventionally hardened specimens. The aim of the study is to investigate the lubricated sliding wear behaviors of laser surface hardened GCr15 steel specimens and to compare the effect of the different microstructure compositions for laser transformation hardening with those of conventionally hardened and quenched. Moreover, the wear properties of the GCr15 steel and its corresponding wear mechanism under the lubricated wear conditions will also be studied.
The design of extrusion die has been investigated by autofrettage technique considering the characteristics of the extrusion die. Ideal elastoplastic autofrettage model was established and the stress formulae of three loading procedures were derived and the theoretical calculation method of the maximum autofrettage pressure and working load was put forward. The simulations of stress distribution and the inwall displacement of the autofrettaged extrusion die were performed using MARC finite element software, and the results coincided well with the theoretical derivations. It was observed that the autofrettaged extrusion die can raise the elastic loading capacity under the inner displacement limit , without the appearance of reverse yielding and reyielding under the working load. The results show that the autofrettage technique is appropriate for the design of extrusion die.
Hot forming is the advanced technology that integrates traditional heat treatment and cold stamping. The ultra high strength component with the tensile strength 1600 MPa can be manufactured by hot forming. The tensile tests of the hot forming material and part are investigated. The yield limitation of the part by hot forming is more than 1000MPa, and the strength limitation is more than 16000MPa. Three-point bending experiments of the reinforced beam by cold stamping and hot forming are carried out. The experimental results show the parts by hot forming have excellent loading capability and impact resistance. The optimization design method for hot forming part is investigated and presented.
It is important to analyze the contact problem in engineering design. However, the analytic calculation is complicated, and the solution is very limited. Taking the shrink mating on flat container of whole wallboard profile as an instance, the implementation of contact problem based on ANSYS finite element software and contact element approach is introduced, and the numerical solution can act as a guide to solution of engineering contact problem.
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